EP0844944A1 - Anordnung zum kontrollieren des widerstandes einer an einem übertrager angeschlossenen last - Google Patents
Anordnung zum kontrollieren des widerstandes einer an einem übertrager angeschlossenen lastInfo
- Publication number
- EP0844944A1 EP0844944A1 EP96910908A EP96910908A EP0844944A1 EP 0844944 A1 EP0844944 A1 EP 0844944A1 EP 96910908 A EP96910908 A EP 96910908A EP 96910908 A EP96910908 A EP 96910908A EP 0844944 A1 EP0844944 A1 EP 0844944A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transformer
- primary
- resistance
- load
- arrangement according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004804 winding Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/017—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including arrangements for providing electric power to safety arrangements or their actuating means, e.g. to pyrotechnic fuses or electro-mechanic valves
- B60R21/0173—Diagnostic or recording means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/027—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems between relatively movable parts of the vehicle, e.g. between steering wheel and column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Definitions
- the present invention relates to an arrangement for controlling the resistance of a load connected to a transformer on the secondary side - preferably the load
- a rotary transmitter is used, for example, for signal transmission between a control unit and an airbag installed in a steering wheel of a vehicle.
- the functionality of an airbag must be checked continuously so that it is immediately ready for use in any emergency situation.
- the resistance of the squib which is typically in the range of
- the prior art cited provides an oscillating circuit on the secondary side of the rotary transformer, which is excited by a control signal from the primary side. After the control signal has been switched off, the decay of the response signal of the resonant circuit is transmitted back to the primary side and the resistance on the secondary side is determined from the time constant of the decaying response signal.
- the resistance of a load connected to a transmitter on the secondary side - preferably the squib of an airbag - thereby
- Deviation from a predetermined value controls that only the inductance of the transformer is measured on the primary side. This measure is based on the knowledge that the inductance measured on the primary side shows a clear dependence on a load resistance connected on the secondary side. If a deviation of the measured inductance from a certain value is found, it can be deduced from this that the load resistance has changed. A shift in the inductance can therefore be used to signal an incorrect change in the load.
- a measuring resistor is inserted in the primary circuit of the transformer, which is much larger than the primary input resistance of the transformer.
- the transformer is fed on the primary side by a pulse-shaped control voltage and the rise and / or fall time constant of a measurement voltage falling across the measuring resistor is determined.
- This time constant is almost exclusively depends on the primary inductance of the transformer, which creates a clear connection to the load resistance.
- the transformer input resistance which shows no clear dependence on the load resistance, therefore has no influence on the measured time constant.
- the measured time constant therefore clearly provides information as to whether the load has changed its resistance due to a malfunction.
- FIG. 1 shows a transformer with a load connected to it.
- FIG. 2 shows a primary-side replacement circuit diagram of a transformer with devices connected to it for determining the inductance of the transformer.
- FIG. 3 shows a voltage curve measured on the primary side of the transformer.
- FIG. 4 shows the dependence of the transformer inductance on a load resistance connected on the secondary side.
- FIG. 1 shows the basic circuit diagram of a transformer and a load resistor Rz connected to it on the secondary side.
- the transmitter Ü is, for example, a rotary transmitter, which is between one with an airbag equipped steering wheel and the fixed steering column is arranged.
- the load Rz connected on the secondary side then corresponds to the resistance of a squib of the airbag.
- a squib typically has a resistance Rz of approximately 2 ohms. If the resistance of the squib changes beyond certain limit values, this indicates that the function of the airbag is disturbed. Such a situation must be signaled in the vehicle.
- the control of the squib resistance Rz is carried out continuously and repeatedly.
- a measuring resistor Rm is connected in series with the resistor Rs.
- a voltage measuring device Mu measures the measuring voltage Um falling across the measuring resistor Rm.
- a pulse-shaped control voltage U is present at the primary-side input of the transformer U.
- FIG. 3 shows the course of the measuring voltage Um in response to a pulse of the control voltage U. Both the rise and the fall of the measurement voltage Um take place with a time constant ⁇ . This time constant ⁇ depends on the in the following way
- the rise and fall time constant ⁇ depends both on the inductance Ls and the resistance Rs of the transformer. Both the inductance Ls and the resistance R ⁇ of the transformer show a dependence on the load resistance Rz connected on the secondary side. The dependence of the resistance R ⁇ on the load resistance Rz but is not clear.
- the measuring resistor Rm is therefore chosen to be so large (at least 10 times as large as Rs) that the influence of the resistor Rs almost disappears at the time constant ⁇ .
- the rise or fall time constant ⁇ of the measuring voltage Um is then almost only dependent on the inductance Ls of the transformer.
- the rise or fall time constant ⁇ can be determined in the following way.
- the measurement voltage Um is fed to a threshold value decision SE (see FIG. 2).
- this threshold value decider has a lower threshold Uu and an upper threshold Uo for the measuring voltage Um.
- a counter is started in a time recording unit ZE. As soon as the measuring voltage reaches the upper threshold Uo, the counter is stopped. The counter reading is then proportional to the rise time constant ⁇ . If the time constant ⁇ is to be determined in the falling course of the measuring voltage, the time becomes in a similar way determined between falling below the upper voltage threshold Uo and reaching the lower voltage threshold Uu.
- the upper and lower voltage thresholds can be described as follows:
- ⁇ T denotes the time determined by the time recording unit Ze when the measuring voltage changes between the two voltage thresholds Uu and Uo (cf. FIG. 3).
- the equation (5) gives the following for the time constant:
- the inductance Ls of the transformer is:
- FIG. 4 shows the dependence of the inductance Ls measured on the primary side on the secondary side Transmitter connected load resistance Rz shown. This dependency is clear.
- the two characteristic curves for the inductance Ls drawn above and below the solid characteristic curve result from an axial offset between the primary and the
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Air Bags (AREA)
- Protection Of Transformers (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19530588 | 1995-08-19 | ||
| DE19530588A DE19530588A1 (de) | 1995-08-19 | 1995-08-19 | Anordnung zum Kontrollieren des Widerstandes einer an einem Übertrager angeschlossenen Last |
| PCT/DE1996/000739 WO1997006980A2 (de) | 1995-08-19 | 1996-04-27 | Anordnung zum kontrollieren des widerstandes einer an einem übertrager angeschlossenen last |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0844944A1 true EP0844944A1 (de) | 1998-06-03 |
| EP0844944B1 EP0844944B1 (de) | 2001-10-10 |
Family
ID=7769922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96910908A Expired - Lifetime EP0844944B1 (de) | 1995-08-19 | 1996-04-27 | Anordnung zum kontrollieren des widerstandes einer an einem übertrager angeschlossenen last |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6016104A (de) |
| EP (1) | EP0844944B1 (de) |
| JP (1) | JPH11511089A (de) |
| KR (1) | KR100417319B1 (de) |
| BR (1) | BR9610215A (de) |
| DE (2) | DE19530588A1 (de) |
| WO (1) | WO1997006980A2 (de) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19530587A1 (de) * | 1995-08-19 | 1997-02-20 | Bosch Gmbh Robert | Anordnung zum Überprüfen des Widerstandes einer an einem Übertrager angeschlossenen Last |
| DE19737506C1 (de) * | 1997-08-28 | 1998-11-12 | Sican F & E Gmbh Sibet | Anordnung zum Ansteuern einer Auslösevorrichtung eines Rückhaltesystems für Fahrzeuginsassen mit einem Übertrager |
| DE19744760C1 (de) * | 1997-10-10 | 1999-03-18 | Bosch Gmbh Robert | Vorrichtung zum kontaktfreien Übertragen von Signalen zwischen Lenkrad und Lenksäule |
| TW554625B (en) * | 2000-12-08 | 2003-09-21 | Silicon Graphics Inc | Compact flat panel color calibration system |
| DE10102995B4 (de) * | 2001-01-24 | 2006-05-24 | Robert Bosch Gmbh | Datenbus für Rückhaltemittel in einem Fahrzeug |
| US6484974B1 (en) | 2001-09-10 | 2002-11-26 | Union Switch & Signal, Inc. | Controller for switch machine |
| DE10245783A1 (de) * | 2002-10-01 | 2004-04-15 | Robert Bosch Gmbh | Anordnung zum kontaktlosen Übertragen von einem Signal zwischen einem ersten und einem zweiten Fahrzeugteil |
| DE102012201049A1 (de) | 2012-01-25 | 2013-07-25 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Erkennen einer Einsatzfähigkeit einer Ansteuervorrichtung |
| JP5973891B2 (ja) * | 2012-11-22 | 2016-08-23 | ボッシュ株式会社 | エアバッグ制御装置 |
| FR3038269B1 (fr) * | 2015-06-30 | 2017-08-25 | Mersen France Amiens Sas | Surveillance de l'etat d'une bande de transmission de courant destinee a frotter contre un fil de catenaire. |
| US10371739B2 (en) * | 2015-10-30 | 2019-08-06 | Landis+Gyr Llc | Arrangement for detecting a meter maintenance condition using winding resistance |
| DE102018218238A1 (de) | 2018-10-24 | 2020-04-30 | Rolls-Royce Deutschland Ltd & Co Kg | Überwachung und Auslösung von elektrischen Sicherungen |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3540031A1 (de) * | 1985-08-21 | 1987-02-26 | Licentia Gmbh | Anordnung zum ueberwachen eines veraenderlichen elektrischen widerstandes |
| JP2578368B2 (ja) * | 1988-04-15 | 1997-02-05 | ダイムラー―ベンツ・アクチエンゲゼルシヤフト | 監視すべき負荷を含む回路の検出兼エネルギ供給装置 |
| DE3812633A1 (de) * | 1988-04-15 | 1989-10-26 | Daimler Benz Ag | Verfahren zur kontaktlosen widerstandsmessung |
| US4893109A (en) * | 1988-10-05 | 1990-01-09 | Ford Motor Company | Airbag electrical igniter readiness detector |
| US4956631A (en) * | 1989-03-20 | 1990-09-11 | Mitsubishi Denki Kabushiki Kaisha | Fault detector for vehicle safety system |
| JPH0742878Y2 (ja) * | 1989-04-14 | 1995-10-04 | 日本精工株式会社 | 乗員保護装置の故障検出装置 |
| SE9003728L (sv) * | 1990-11-23 | 1991-12-09 | Volvo Ab | Diagnoskrets foer detektering av funktionsfel vid elektriskt utloesbara taendare |
| JP2551255B2 (ja) * | 1991-03-14 | 1996-11-06 | 日本電装株式会社 | 車両用乗員保護システムのための故障判定装置 |
| US5461358A (en) * | 1993-09-08 | 1995-10-24 | Delco Electronics Corporation | Resistance measurement circuit for external deployment path of sir system |
| JP2661863B2 (ja) * | 1993-10-29 | 1997-10-08 | 富士通テン株式会社 | 車両のエアバッグシステムにおけるスクイブライン系診断装置 |
| JP3505789B2 (ja) * | 1994-06-03 | 2004-03-15 | 株式会社デンソー | 乗員保護装置用故障診断回路およびその診断方法 |
| US5541523A (en) * | 1994-09-19 | 1996-07-30 | Ford Motor Company | System for detecting operability of an airbag squib resistor |
-
1995
- 1995-08-19 DE DE19530588A patent/DE19530588A1/de not_active Ceased
-
1996
- 1996-04-27 EP EP96910908A patent/EP0844944B1/de not_active Expired - Lifetime
- 1996-04-27 DE DE59607889T patent/DE59607889D1/de not_active Expired - Fee Related
- 1996-04-27 KR KR10-1998-0701181A patent/KR100417319B1/ko not_active Expired - Fee Related
- 1996-04-27 WO PCT/DE1996/000739 patent/WO1997006980A2/de not_active Ceased
- 1996-04-27 BR BR9610215A patent/BR9610215A/pt not_active IP Right Cessation
- 1996-04-27 US US09/029,092 patent/US6016104A/en not_active Expired - Fee Related
- 1996-04-27 JP JP9508797A patent/JPH11511089A/ja not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9706980A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US6016104A (en) | 2000-01-18 |
| EP0844944B1 (de) | 2001-10-10 |
| DE19530588A1 (de) | 1997-02-20 |
| BR9610215A (pt) | 1999-06-29 |
| JPH11511089A (ja) | 1999-09-28 |
| KR19990037702A (ko) | 1999-05-25 |
| KR100417319B1 (ko) | 2004-05-10 |
| WO1997006980A2 (de) | 1997-02-27 |
| WO1997006980A3 (de) | 1997-03-20 |
| DE59607889D1 (de) | 2001-11-15 |
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